CN102019382A - Low-sodium high-viscosity tin plate mold flux - Google Patents
Low-sodium high-viscosity tin plate mold flux Download PDFInfo
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- CN102019382A CN102019382A CN 200910196195 CN200910196195A CN102019382A CN 102019382 A CN102019382 A CN 102019382A CN 200910196195 CN200910196195 CN 200910196195 CN 200910196195 A CN200910196195 A CN 200910196195A CN 102019382 A CN102019382 A CN 102019382A
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- viscosity
- slag
- tin plate
- covering slag
- mold flux
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Abstract
The invention discloses a low-sodium high-viscosity tin plate mold flux which comprises the following components by weight percent: 44.1-46.1% of SiO2 (silicon dioxide), 4.6-6.6% of Al2O3 (aluminum oxide), 37.8-39.8% of CaO (calcium oxide), 1.6-3.6% of Na2O (sodium oxide), 8.6-9.2% of F (fluorine), and 2.8-3.8% of T.C (technetium), and the alkalinity R is 0.88-0.97. By adopting the mold flux, the slag inclusion of a slab can be solved and the corrosion problem of the surface of the slab caused by sodium hydroxide formed after rolling of the post-process step can be reduced during the casting of a tin plate.
Description
Technical field
The present invention relates to the continuous-casting steel pouring technology, particularly a kind of low sodium high viscosity tin plate crystallizer protecting residue.
Background technology
The tin plate steel grade is mainly used in pop can, requires very high for surface quality.Because the liquid fluctuating of continuous casting in casting cycle causes molten steel to be involved in covering slag, form the slab slag inclusion.During back operation slab rolling, some 0.2mm thickness specifications (common is that 0.3mm is thick) particularly, inside has the slab of slag inclusion to appear behind cold rolling, when slag inclusion place tin layer is not thoroughly covered or covered not fine and close, run into the weather of south and Southeast Asia humidity, moisture in the atmosphere accumulates in the slit of slag inclusion thing or pit, sodium aluminate salt in the slag inclusion thing generation NaOH that is dissolved in the water, and NaOH has very strong corrosiveness to the tin layer, cause the local variable color of tin layer, come off, finally cause the user quality objection.
Existing tin plate crystallizer protecting residue, its composition percentage by weight is: SiO
230.96 Al～35.96%,
2O
32.88～4.88%, CaO 28.06～33.06%, Na
2O 12.56～14.56%, F 7.3～9.3%, T.C 3.9～5.34%, basicity R 0.88～0.97.If volume slag problem, the then Na of high-load in the covering slag take place in casting process
2O, operation is rolling in the back appear after, easily be formed with the NaOH of corrosiveness with the water electrode in the atmosphere, finally cause quality objection.
Volume slag problem if occur liquid fluctuating in the casting cycle, then very easily takes place because viscosity is lower in this covering slag.
Summary of the invention
The purpose of this invention is to provide a kind of low sodium high viscosity tin plate crystallizer protecting residue, when tin plate is cast, can solve the slab slag inclusion, reduce slab at the etching problem of the rolling back formation of back operation NaOH to the surface.
Technical scheme of the present invention is,
Low sodium high viscosity tin plate crystallizer protecting residue, its composition percentage by weight is:
SiO
2 44.1～46.1％
Al
2O
3 4.6～6.6％
CaO 37.8～39.8％
Na
2O 1.6～3.6％
F 8.6～9.2％
T.C 2.8～3.8％
Basicity R 0.88～0.97.
Further, this covering slag basicity R is preferably 0.84～0.87.
This covering slag viscosity is 4 ± 0.6Pa.S.
In composition of the present invention,
1, reduces Na in the covering slag
2O content
For the aluminic acid sodium salt that reduces in the slag inclusion thing is formed with the NaOH of corrosiveness in the rolling back of appearing of back operation in air, just must considers cancellation or reduce Na in the covering slag
2O content is to reduce the probability that the surface forms NaOH.Therefore, the present invention is with Na in the covering slag
2O content reduces to 1.6%～3.6% by original 13.56 ± 1.0%.
Because Na in the covering slag
2The main effect of O is to reduce the slag system fusing point, and after its content reduced, the fusing point of new slag system rose to about 1140 ℃ by original 995 ℃.But under this temperature, can not influence the burn-off rate of covering slag.
2, improve the anti-roll slag ability of covering slag
In casting cycle, because the influence of various factors liquid fluctuating will inevitably occur in the crystallizer, when liquid fluctuating during greater than the melting layer thickness of covering slag, the molten steel at meniscus place will be involved in covering slag inevitably in the crystallizer, form slab volume slag.Therefore, must improve the anti-roll slag ability of covering slag, mainly adjust following parameter and realize:
(1) improves viscosity
Viscosity is meant that ground-slag is fused into the mobile performance of liquid, common viscosity with torsional pendulum viscometer or 1300 ℃ of bits of rotary viscosity design determining, the flowability of coming more different bits.Therefore, the present invention is increased to 4 ± 0.6Pa.S with viscosity by original 0.16 ± 0.04Pa.S.
The main means that improve viscosity are to realize by adjusting basicity (R), i.e. CaO/SiO
2Value.When basicity reduced, viscosity just improved; When basicity improved, viscosity just descended.When the basicity of covering slag between 0.8～1.0, help to adsorb the Al in the molten steel
2O
3, the degree of purity of raising molten steel.Therefore, under this basicity condition, this slag system helps to absorb Al in the steel
2O
3Field trash can further improve the degree of purity of molten steel.Therefore, basicity of the present invention is 0.88～0.97, preferred 0.84～0.87.
(2) improve melting layer thickness
If produce liquid fluctuating in the casting cycle, but the melting layer thickness of covering slag is greater than the liquid fluctuating value, and this moment, the probability of molten steel volume slag was greatly diminished.Therefore, must consider to improve the melting layer thickness of covering slag.
The main means that improve covering slag melting layer thickness are to realize by adjusting carbon.Carbon mainly works to regulate the covering slag burn-off rate.Carbon content is low more in the covering slag, and its burn-off rate is fast more, and melting layer is thick more.Therefore, the present invention is reduced to 2.8%～3.8% with carbon content by original 3.9%～5.34%.Melting layer thickness is increased to about 10mm.
(3) reduce covering slag proportion
If covering slag proportion is too big; when covering slag is pushed crystallizer; might make local slag layer uneven thickness in the crystallizer; melting layer uneven thickness when causing covering slag finally to melt; cause when liquid fluctuating; the place that melting layer is thin makes molten steel be involved in covering slag easily, produces dreg defect.Therefore, the present invention considers to reduce the proportion of covering slag, reduces to 0.72 ± 0.1 by original 0.78 ± 0.1.Make when covering slag pushes, cover crystallizer surface equably, spreadability, melting are strong, and fusing back flowability has also obtained enhancing.
(4) other composition
Because above composition is adjusted, also carried out corresponding change for forming other compositions of slag system, mainly contain Al
2O
3Content adjusts slightly, but as long as initial value content is lower than 10%, does not influence the ability that covering slag absorbs field trash; F-in the covering slag mainly plays the melting temperature of regulating covering slag, no longer raises for guaranteeing the covering slag fusing point, so do not adjust;
Beneficial effect of the present invention
Since in the covering slag Na content lower, behind the cast tin plate, through rolling and zinc-plated after, be difficult for formation NaOH, thereby such blemish do not take place;
2. because covering slag viscosity is higher, can adsorb slag inclusion thing in the molten steel in mold, improve the strand cleannes, a large amount of volume slag probabilities that reduce.
The specific embodiment
Embodiment of the invention composition is referring to table 1, and table 2 is a physical property.
Table 1
| Embodiment | SiO 2 | Al 2O 3 | CaO | Na 2O | F | T.C | R |
| 1 | 45.2 | 5.1 | 37.9 | 2.1 | 8.8 | 2.9 | 0.84 |
| 2 | 44.8 | 5.5 | 38.2 | 3.4 | 8.7 | 3.1 | 0.85 |
| 3 | 45.8 | 5.9 | 38.9 | 2.4 | 9.0 | 3.4 | 0.85 |
| 4 | 46.0 | 6.1 | 39.1 | 3.5 | 8.7 | 3.1 | 0.85 |
| 5 | 45.8 | 6.2 | 38.8 | 1.9 | 8.8 | 2.9 | 0.85 |
| 6 | 44.2 | 5.6 | 38.5 | 3.4 | 8.9 | 3.1 | 0.87 |
| 7 | 45.8 | 6.5 | 39.2 | 3.6 | 8.7 | 3.1 | 0.85 |
| 8 | 44.1 | 5.8 | 39.7 | 3.4 | 8.8 | 3.1 | 0.90 |
| 9 | 45.9 | 6.2 | 38.9 | 1.7 | 8.8 | 2.9 | 0.86 |
| 10 | 45.0 | 4.7 | 38.4 | 3.6 | 8.9 | 3.1 | 0.84 |
Table 2
| Embodiment | Fusing point ℃ | H 2O | Viscosity | Proportion (g/cm 3) |
| 1 | 1120 | 0.4 | 3.6Pa.S | 0.70 |
| 2 | 1140 | 0.3 | 3.8Pa.S | 0.72 |
| 3 | 1160 | 0.4 | 4.5Pa.S | 0.72 |
| 4 | 1155 | 0.4 | 4.2Pa.S | 0.72 |
| 5 | 1124 | 0.4 | 3.9Pa.S | 0.72 |
From as can be seen above-mentioned, covering slag physical property of the present invention: fusing point: 1140 ℃ ± 30 ℃, H
2O≤0.40%, viscosity 4 ± 0.6Pa.S, proportion (g/cm
3) 0.78 ± 0.1.
Claims (3)
1. low sodium high viscosity tin plate crystallizer protecting residue, its composition percentage by weight is:
SiO
2 44.1～46.1％
Al
2O
3 4.6～6.6％
CaO 37.8～39.8％
Na
2O 1.6～3.6％
F 8.6～9.2％
T.C 2.8～3.8％
Basicity R 0.88～0.97.
2. low sodium high viscosity tin plate crystallizer protecting residue as claimed in claim 1 is characterized in that this covering slag basicity R is preferably 0.84～0.87.
3. low sodium high viscosity tin plate crystallizer protecting residue as claimed in claim 1 is characterized in that this covering slag viscosity is 4 ± 0.6Pa.S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910196195 CN102019382B (en) | 2009-09-23 | 2009-09-23 | Low-sodium high-viscosity tin plate mold flux |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910196195 CN102019382B (en) | 2009-09-23 | 2009-09-23 | Low-sodium high-viscosity tin plate mold flux |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102019382A true CN102019382A (en) | 2011-04-20 |
| CN102019382B CN102019382B (en) | 2013-05-29 |
Family
ID=43861394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910196195 Active CN102019382B (en) | 2009-09-23 | 2009-09-23 | Low-sodium high-viscosity tin plate mold flux |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102699301A (en) * | 2012-06-26 | 2012-10-03 | 南京钢铁股份有限公司 | Steel continuous casting process for ultra supercritical high-pressure boiler tube |
| CN103128240A (en) * | 2011-11-28 | 2013-06-05 | 上海梅山钢铁股份有限公司 | Low carbon steel continuous casting crystallizer casting powder |
| CN103372637A (en) * | 2012-04-27 | 2013-10-30 | 宝山钢铁股份有限公司 | Crystallizer casting powder |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4224063B2 (en) * | 2003-02-25 | 2009-02-12 | モーク・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング | Displacement device |
| JP4460463B2 (en) * | 2005-01-11 | 2010-05-12 | 新日本製鐵株式会社 | Mold powder for continuous casting of steel |
| JP4337748B2 (en) * | 2005-03-14 | 2009-09-30 | 住友金属工業株式会社 | Mold powder for continuous casting of steel |
| CN101053893A (en) * | 2006-04-14 | 2007-10-17 | 马鞍山钢铁股份有限公司 | Protective cinder for special-shaped blank continuous casting |
| KR100749024B1 (en) * | 2006-06-22 | 2007-08-13 | 주식회사 포스코 | Continuous casting method using melting mold flux |
-
2009
- 2009-09-23 CN CN 200910196195 patent/CN102019382B/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103128240A (en) * | 2011-11-28 | 2013-06-05 | 上海梅山钢铁股份有限公司 | Low carbon steel continuous casting crystallizer casting powder |
| CN103128240B (en) * | 2011-11-28 | 2015-06-03 | 上海梅山钢铁股份有限公司 | Low carbon steel continuous casting crystallizer casting powder |
| CN103372637A (en) * | 2012-04-27 | 2013-10-30 | 宝山钢铁股份有限公司 | Crystallizer casting powder |
| CN103372637B (en) * | 2012-04-27 | 2015-07-22 | 宝山钢铁股份有限公司 | Crystallizer casting powder |
| CN102699301A (en) * | 2012-06-26 | 2012-10-03 | 南京钢铁股份有限公司 | Steel continuous casting process for ultra supercritical high-pressure boiler tube |
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| Publication number | Publication date |
|---|---|
| CN102019382B (en) | 2013-05-29 |
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